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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 7:41  
clear_day Transit: 11:47  
SunsetSet: 15:53 south
sunny DaytimeWhat's Visible Now?
All Constellations » Cygnus » 


Altitude: 69.3°   Azimuth: 63.6°   Direction: East-North-East

HR7843 is a variable and double main-sequence star in the constellation of Cygnus.

HR7843 visual magnitude is 5.91. Because of its reltive faintness, HR7843 should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about HR7843:


HR7843 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 69.3°
Azimuth: 63.6°
Direction: East-North-East

Celestial coordinates and finder chart of HR7843

HR7843 is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR7843 are provided in the following table:

20h 29m 27s
+56° 04’ 05”

The simplified sky map below shows the position of HR7843 in the sky:

Finder chart HR7843 star
Simplified finder chart for HR7843.

Visibility of HR7843 from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

HR7843 is circumpolar and transits at 15:48 UTC (altitude: 85.4°)

Digitized Sky Survey image of HR7843

The image below is a photograph of HR7843 from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). The proper motion of HR7843 is 0.002 arcsec per year in Right Ascension and 0.005 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of HR7843 star
DSS2 image of HR7843. The red arrow shows the motion of HR7843 during the next 100000 years (3.33 arcmin in Right Ascension and 8.33 arcmin in declination);

Distance of HR7843 from the Sun and relative movement

HR7843 is distant 895.60 light years from the Sun and it is moving towards the Sun at the speed of 22 kilometers per second.

274.73 pc
895.60 ly
-22 km/s
0.002 arcsec/year
0.005 arcsec/year

Spectral properties of HR7843

HR7843 belongs to spectral class B9 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR7843 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR7843. Attribution: Richard Powell / CC BY-SA

HR7843 star system properties

HR7843 is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the HR7843 double sysyem:

0.8 arcsec

Alternative designations of HR7843